ARM: mark axxia platform as deprecated

The Axxia platform was initially upstream by Anders Berg for LSI and
later Avago, but this included only support for I2C and reset drivers,
while most of the interesting bits (network, pci, rapidio, usb, ...) or
the arm64 platform support were never merged.

The downstream kernel was maintained by Intel up to linux-5.15 when
the product line was discontinued. Known users include Nokia and
Ericsson, but both of them use kernels derived from the out-of-tree
drivers rather than the upstream version, and will be able to continue
doing that even when the rudimentary mainline support is gone.

Mark it as deprecated for removal after the next LTS kernel.

Link: https://github.com/axxia/linux-yocto
Cc: Stefan Wiehler <stefan.wiehler@nokia.com>
Reviewed-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Reviewed-by: Ethan Nelson-Moore <enelsonmoore@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/mach-axxia/Kconfig

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 config ARCH_AXXIA
-	bool "LSI Axxia platforms"
+	bool "LSI Axxia platforms (DEPRECATED)"
 	depends on ARCH_MULTI_V7 && ARM_LPAE
 	select ARM_AMBA
 	select ARM_GIC
@@ -13,3 +13,5 @@ config ARCH_AXXIA
 
 	  The LSI Axxia platforms require a Flattened Device Tree to be passed
 	  to the kernel.
+
+	  This platform is scheduled for removal in early 2027